JPH0512987B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a novel method for milling grains such as rice and wheat.

[Conventional technology]

Conventionally, two methods have been generally used for grain milling: a friction method and a grinding method. The friction method is a method in which a milling roll with protrusions on the surface is rotated in a milling room, and the bran layer on the surface is torn and removed by the contact pressure and frictional force that act between the grains. In the grinding method, a grinding roll made of diamond sand is rotated in the milling room, and the bran layer on the surface of the grain is scraped off with the sharp edges of the diamond sand particles. In addition, in the grinding method, the technology of protruding a resistor at a suitable location on the outer periphery of the Kongo roll to improve the grinding efficiency and the durability of the Kongo roll was developed in the 29th century.
-Already proposed as No. 12734.

[Problem that the invention seeks to solve]

However, in the case of the friction type, it is essential to apply high pressure, and this pressure has the disadvantage of easily causing cracked rice and shattering of weak internal grains. Because the grain surface is smooth, the working efficiency is poor, and the pounding precision cannot be increased beyond a certain level, so it cannot be used, for example, for polishing sake-brewing rice. On the other hand, in the case of the grinding method, the grain surface is scraped off with the sharp edges of the diamond sand particles, creating thin and deep grooves that resemble cat's claws, and these grooves reach into the inner part of the grain. This has the disadvantage of damaging the grains and reducing their taste.On the other hand, since the surface of the grains is partially scraped in streaks, the overall surface of the grains has poor milling efficiency, and the process takes a long time. It has drawbacks such as requiring a lot of heat and generating a lot of heat. Further, in the above-mentioned Utility Model Publication No. 29-12734, although a resistor is attached to the surface of the roll, this resistor only has the function of resisting, and all pounding is performed using the Kongo roll.
Therefore, this is not a proposal for a grain milling method based on a new milling theory, but merely an improvement on the grinding method.

In view of the above points, the present invention aims to provide a completely new grain milling method based on the theory of milling, which is different from conventional grain milling methods. It is peeled off thinly, like peeling the skin, to allow the process of extraction.

[Means for solving problems]

The technical means of the grain milling method of the present invention is that the milling roll has a circular cross section, and a large number of ceramic blades are provided on the peripheral wall of the milling roll in a direction substantially along the longitudinal axis.
The blade protrudes by 0.5 to 3 mm, and the top of this blade has an acute angle and is sharply pointed, and the rake angle of the cutting edge is set to be negative. The purpose is to feed the milled grain between the milling roll and the milling outer cylinder by rotating it internally, and to proceed with milling by stripping off the surface of the grain thinly and widely with a blade.

[Effect]

In the scraping-type grain milling method of the present invention, the milling roll is rotated within the milling outer cylinder, so that the blade collides with the grains supplied to the gap between the two, and the sharp edges of the blade cause the grain to be grained. The surface of the grain is scraped off. At this time, the peeling action by the blade body is caused by the fact that the blade body is long in the longitudinal direction and has a sharply pointed top, and is fixed in a state slightly protruding from the whitening roll peripheral wall surface. is set so that the rake angle with respect to the ground grain to be pounded is negative, that is, the blade is in a flat state, so the surface of the grain is thin and has a relatively wide area, so that it is shaped like a flake. It starts to get scraped away. Furthermore, during peeling, the surface of the grain is scraped with a sharp blade, so a large rotational force acts on the grain as a reaction to this, resulting in a strong stirring action between the grains during the peeling process. Then, as a result of the peeling action progressing while being subjected to this stirring action, the entire surface of all grains is scraped evenly and evenly.

〔Example〕

An embodiment of the scraping-type grain milling method of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing the principle of grain milling by scraping, where 1 is a blade, 2 is a milling roll, and A is a grain to be pounded. The blade body 1 is made of ceramic, and the top portion 3 is formed into an acute angle of 10 to 90 degrees. For rice polishing, a temperature of 50 to 80 degrees is particularly suitable. Also top 3
It is necessary to have a sharp point, and the radius of the top tip (edge) is preferably 50 microns or less. Such sharp edges can be achieved by using ceramics, whereas ordinary metals wear out quickly with use, making it impossible to maintain sharp edges. Blade 1 is refined roll 2
The upper part of the blade body 1 is fixed to the roll 2 in a semi-buried manner.
protrudes from the circumferential surface of The protruding dimension of blade 1 is
0.5 to 3 mm, and 1 to 2 mm suitable for domestic rice. Further, the angle of the cutting edge of the blade body 1 is set so that the rake angle with respect to the ground grain is negative as shown in the first figure. That is, the blade should lie flat against the grain. When the rake angle is positive, so-called the blade stands up, the blade bites deeply into the grain, making it impossible to strip the surface of the grain into flakes. When such a milling roll 2 is rotated at high speed within the milling outer cylinder 4, the blade body 1 collides with the milled grain A that is being fed into the gap between the milling roll 2 and the milling outer cylinder 4, and the blade The surface of the grain A is thinly and scraped off over a relatively wide area by the sharp edges of the body 1 so as to peel off the skin. This peeling action by the blade 1 is completely different from the conventional friction method or grinding method. That is, in the friction method, grains are peeled by the frictional action of contact with each other, and in the grinding method, grains are scraped off in a linear manner using the pointed corners of the diamond sand particles.
On the other hand, peeling using the blade 1 of the present invention is a method of scraping the surface of the grain A into flakes like peeling the skin with a knife, so it is efficient without making deep scratches on the grain surface. Can be peeled. Since the peeling method of the present invention is significantly different from conventional methods, it is appropriate to refer to it as a peeling method. Furthermore, in the peeling method of the present invention, since the sharp edge of the blade 3 pulls the grain and scrapes it, a large rotational force acts on the grain as a reaction, and as a result, the grain being peeled is Vigorous agitation occurs, and the grains are peeled evenly. Such a stirring action is unique and occurs only in the case of the scraping method of the present invention; in the case of conventional grinding methods, the rotational force exerted on the grains is small, so the intense stirring action of the present invention is not possible. It doesn't happen. In addition, since the peeling method of the present invention uses the blade 1 to scrape off the grain surface, it is possible to efficiently peel the grain regardless of the conditions under which the grain is milled. For example, in the case of rice milling, There is no decrease in efficiency during the initial stage of milling from brown rice, and the milling accuracy can be increased freely, so it can be used for milling rice for sake brewing, and it can also be used to remove milled rice. It can be used for a wide range of purposes, including wheat polishing.

Figures 2 and 3 show grain milling equipment using the method of the present invention. The blade 1 has a substantially regular triangular cross section, and the whitening roll 2
The base of the blade 1 is fitted into the groove 5 formed in the roll, and the top 3 of the blade 1 is fixed so as to protrude from the peripheral wall surface of the roll. The whitening roll 2 is cylindrical, and its diameter is usually about 10 to 40 cm.
It can be rotated at 500-2000 RPM. Blade bodies 1 are attached to the outer peripheral wall surface of this whitening roll 2 at intervals of 10 to 50 mm. Therefore, about 12 to 60 blade bodies 1 are attached to the whitening roll 2 having a diameter of 20 cm. The whitening outer cylinder 4 is a cylinder having a circular cross-section or a polygonal shape such as hexagonal or octagonal, and is fixedly installed, and the whitening roll 2 is rotated inside the whitening outer cylinder 4.
Note that the refined outer cylinder 4 may be made of a perforated plate.
The gap between the milling roll 2 and the milling outer cylinder 4 is about 5 to 20 mm, especially 7 to 15 mm for rice milling, but the gap size depends on the type and size of the milled grains,
Determine as appropriate depending on the material, etc. The conditions for the inner surface of the polished outer cylinder 4 are free, and there is no need to provide any protrusions, and metal resistance pieces 6 or a blade similar to the roll surface may be attached.

In addition, in the present invention, the shape and mounting dimensions of the blade body 1 are free. For example, it is possible to use a single roll extending over the entire length of the roll 2, or a combination of rolls with appropriate short dimensions as shown in FIG. Further, the blade body 1 may not only be completely parallel to the longitudinal axis of the roll 2, but may also be attached in a gentle spiral shape, for example, with a slight inclination. Furthermore,
It is also possible to use various types of blades, such as one with a plurality of edges on one blade, and one with a partial edge missing part in a part of the blade in the longitudinal direction. Furthermore, the blade bodies may be attached to the roll surface not at regular intervals but may be arranged in a manner that is densely arranged in the circumferential direction. Further, the angle of inclination of the protruding portion of the blade 1 can be freely determined on both the front side and the rear side, and is preferably set as appropriate depending on the conditions of the milled grains.
In FIG. 3, 7 is an end member, and 8 is a rotating shaft.

〔Effect of the invention〕

In the grain milling method of the present invention, the surface of the grain is scraped thinly and relatively widely using the sharp edge of the blade with a negative rake angle.
It can efficiently peel any type of grain without causing deep damage to the grain. In addition, since a vigorous stirring action occurs on the grain at the same time as the peeling action, the surface of the grain can be peeled evenly and uniformly. Furthermore, since the blade body is made of ceramic, there is extremely little wear and tear on the blade edge, and stable work can be performed over a long period of time.

In addition to being used alone, the method of the present invention can also be used for milling grains in combination with conventional grinding methods or friction methods.

[Brief explanation of the drawing]

The drawings show an embodiment of the grain milling method according to the present invention, FIG. 1 is a diagram explaining the theory of grain milling by scraping according to the present invention, and FIG. 2 is a cross-sectional view of the main part of the grain milling device used in the present invention. FIG. 3 is a longitudinal sectional view. DESCRIPTION OF SYMBOLS 1...blade body, 2...whitening roll, 3...top, 4...whitening outer cylinder, 5...groove, 6...resistance piece.

Claims (1)

[Claims] 1 The whitening roll has a circular cross section, and a large number of ceramic blades are provided on the peripheral wall of the roll so as to protrude by 0.5 to 3 mm approximately along the longitudinal axis. , sharply pointed;
In addition, the rake angle of the cutting edge is set to be negative, and this milling roll is rotated inside a fixed milling barrel, and the milled grain is supplied between the milling roll and the milling barrel. , a scraping-type grain milling method characterized by proceeding with milling by stripping the surface of the grain thinly and widely with a blade.